Optical instrument.



H. L. DE ZENG.'

OPTICAL INSTRUMENT.

APPLICATION FILED JULY 28, 1913.

1, 1 1 5,408, Patented 001;. 27, 1914.

2 SHEETSSHEET 1.

H. L. DB ZENG.

OPTICAL INSTRUMENT;

APPLICATION FILED JULY 2a, 1913.

1, 1 1 5,408. Patented 001;. 27, 1914.

2 SHEETS-SHEET 2v WITNESSES" '-Be. it known that I, HENRY UNITED STATES PATENT, oEEicE.

H NRY L. DE 'ZENGQOE MAPLE SHADE, NEW JERSEY.

OPTICAL INSTRUMENT.

Specification of Letters Patent.

Patented Oct. 27, 1914.

Application filed July 28, 1913. Serial No. 781,49?

To all whom it may concern L.,DE ZENG, a citizen-of the United .States, residing at Maple .-Shade, in the county of. Burlington, State of NewJersey, have invented a new and useful Optical Instrument, of which the following is a specification.

'My invention optical instrument known. as a perimeter wherein-I have provided means whereby the instrumentmay'be usedwith either reflected or transmitted light, in different colors.

lt further 'consists of an optical .instrument such as a 'perimeter. having a point of fixation and a test object movably mounted EJVllll'l respect thereto, and means carried by 7 said test object for both reflecting or transmitting light, in different colors, therefrom. It further consists of an opticalvinstrument such as a perimeter having a new and 4 novel point of -,fixat1on having. means ,io-r

varying the size thereof, as may be required.

:It'further consists of other novelfeaturesof construction, all as. will: be hereinafter fully" set forth.

:For'the' purpose of illustrating my invenin the accompanyingti'on, I'haVe shown drawings one" form thereof which is at present preferred by me, since-the samehas been found in practice to give satisfactory and reliable results, athou gh it is to be unders tood that the various instrumentalities of which my invention consists can'be variously arranged and organized and thatmy invention' is not limited 'to' the precise arrange ment and organization of theseinstrumentalities as herein shownand described;

Figure 1 represents a side elevation of .a

' perimeter embodying my invention Fig.2

represents 1a ,partial elevation and partial sectional viewof a point of ;fiiiation' employed. Fig. '3 represents a sectional view on line m-m Fig. 2. Figs. 4 and 5- represent side'elevations of portions-of the rotatable members employed with the pointof' fixam1 tion'." Fig. 6 represents a transverse sectio'nalview ofthe test object and support therefor. Fig. 7 represents-a sectional view on lineyf'y' Fig 5. Figs; 8, 9,. 10 and 11 represent lanj views of means employed with the test object for reflecting or trans Fi'gu12 repmitting colored rays of light resents a sectional view on line 2-2 Fig -8, on an enlarged scale; Fig. 13 represents a bottom plan 'v iew of the carrier and a portion of its. support.

relates to a novel and useful rimeter to which. it maybe "applicable:

Similarnumerals of reference indicate cOrreSpOnding'parts in the figures. I Referring to the drawings,"-1 designates suitable relation is curved, although the My invention is designed to provide means for either reflecting or transmitting light in different colors from the test object .of a pe'-- rlmeter, and in the drawings, I have shown a construction embodying my invention,=in:

which the same is shown as applied to what: is known as the McHardy style or type of perimeter and which I have found operates successfully in. practice, but it is, of: course; to be understood that the arrangement of the parts may be varied and other instrumentali ties maybe employed, which will come with in the scope of the invention, andl-"do not therefore desire to be-limited, in every instance, to the exact .form as herein shown anddcscribed,' but desire to. make such changes as maybe necessary, as well as'to employ. the inventionwwith any form of pea perimeter having a standard 2 supported on'a base 3 and having a chin-rest 4, also suitable. relation with respect to the standard 2. Pivotally mounted in suitable-relation to the standard 2 is-a frameor arm 5 carrying the chart-holder and chart- 6- which serve to indicate the "relative position of thetest object with the point of fixation.

7 designates a recording pointer, her'e shown as suitably mounted upon the stand ard and in proper relation with respect to% the chart in order'that thenotations may be suitably made upon .the chart.

8 designates a point of fixation here shown as suitably supported upon the stand ard 2, and which, in the present instance,.is*

composed of support or member 9 having fmeans for connection with a suitable'source: oflightlO, such as a lamp, further details ,of the construction of the point of fixation '80 suitably supported by the base '3, and

adapted to'be'carrie d'by said arm 11 in its.

rotation. or movement With respect to the .said point movedor adjusted upon said arm 11. toward of fixation Sand is adapted tobe "140; In order to supply current to one or moreiof the lamps on the instrument, I have here shown a metal plate 22 supported upon or awayfrom the point of fixation s, in

order that the said test object 12imay be moved through different ineridians lying at angles with the line of the patientsmision, in order than every portion of the're't'inal field is inturn covered or traversed by said test object and consequently any areasliav ing a lackof perception or color sense maybe definitely determined and a proximately located. Any suitable means or moving or adjusting the position of said test object upon the varm ll-may be employed, and as here shown, I have mounted upon the said arm 11, the. pulleys or rollers 13 and 14 around *which pass a suitable cable 15 in suitable. connection with the test object 8, it being understood that suitable motion may beimparted to said rollers. by any proper ors'uitablemeansin order to provide for th'emovementor adjustment of the said .test object on its support.

fcAs here shown, I have mounted the test object 12 upon a carrier 16 movably mounted -ion the arm 11 and connectedwith the cable 15 by a member 177.1; The test object is provided with a source-of light .18, such as a lamp, and any suitable means for conductmg current to saidvlamp may be employed.

" 1: ";v1ded,.carried bv the per1meter, to whlch tained source of current-supplyt in. which For this purpose Ihaveshown the binding posts 19, any number of which may be procbnductors or wires may be connected, if it is desired to have the source of current-sup ply extraneous of the instrument but the in struinent may beprovidedwith a self-conevent,I may locate one. or more-batteries 20 (shown dotted lines) in a .caslng' 21, which will serve as -a'counterpoise andwhich' is carried or'connected with the bar thearms ll but insulated therefrom and to 'Which plate 22,:I connect a wire or'con-. v ductorc23, which is suitable connection withthe'rsource of current-supply, and upon 3,; the-carriage 1460f the-test object I mount a cpntaot piece or finger 24, which is adapted to contact with the plat-e22," and is in suitfiable' connection withfthe test; object in order that the current will be suitably directed to I v i Removably connected. in. any; suitable man neiz'asi for example a bayonet joint as 1llus-,

tra

here shown as consisting of a casing or box ed, with the carrier 16 is the test object,

25, in which is mounted the source of light v 18,- and in the upper-portion of the box,

I provide alight opening'=-2.6, inusuitable relation to the source of'lightfor lamp 18, in,

order that the rays of light-therefrom will be" passed through said" light opening. 26.

Upon the casing or box 25, I movablymount the sli'ght filters and color reflectors in aany wh chi p i ed wi h a ighaopsn ng. 35,- said disk-:34 serving asa cap r lth. a, .fi ied. size opening, Serving as; a sight open-l filters in the disk Inay b'e'empl oyedf, -As;

suitable or desired manner, in order that they will be vso supported that they may be-suitably brought to operative position in order that the lightfilters will transmit the light from the light source in dilferent col- Qrs, and order that the color reflecting substance may be suitably located in operaferent'colors. Also mounted upon the clas-: .ing 2 5Iis1a'disk 29 carrying the color reflecthrs which'cohs ist'of a series of members 5 i 30 of different colors, and mounted in suit' able openings in the'disk, which are adapted jtozrefiect light. One of the-openings of this 'disk,.as =31, isleft blank or is free from. the

color reflecting medium, in order that the go same may be properly positioned with respect-tothelight opening, so that the light filters, when'brought intooperative position with the light disk 26, may transmit .1 the light therethrough. I- also'mount a disk 32 5 upon said casing 25, which is; rovidedwith a. seriesiofi'openiugs; 33 of di erent for wary 'ingIsizes, m order? that the. said: Idisk y be moved to bring one of theiopemngsj 'fiv .5. into operatiyeilposition Lwithrespect. .to he the. size iof thefqmpeningszahdconsequentlythdapparent size 10f the/ob] 6 h Aboybj'th z' disks,.l -station a;lf y mount a plateifl disk! ing, and-which, is always, therefore, 'heldi-n. proper. relationwith respect to the Slight opening. Any}! isu'itable ;nr1.ea.I1.sfor'.v temporarily holding the disks-,ingtheir different positions may be employed. As here shown,

'lrpliovideia spring member .-36 upon the cap; I v 34, which engages with suitable recesses. r, .11

openings-37finqthedisks 32, and} may also proiride a spring member-38 vwhich engages. with suitable openings or Iecesses39 lin'the. disk27, for holding the same in its diflbrent positions. A finger-piece 40 isalso-provlded on the 3dlSk 2,7 for ease of operation, wh le a. finger-piece 41- is provided on, the'disk 32 forfoperating this disk; suitable means for mounting. thellght here. shown, 'with'special reference to Fig. I 12, --I form the. openings 42 imthedisk 27. with. a shoulderv 43, and HQOHQJGH MQB rest a .transparentprotecti-ve plate 44 upon whichzis supported the light filter 45, which is preferably covered by. a. transparent p ate 130 ried by the said point of fixation, and this light opening 48 is preferably fOI md in a tube 49, which is. in suitable engagement with the point of fixation 8, and rotatably mounted upon said tube 49 is a sleeve 50, provided with a series of openings 51 of different or varying sizes, which openings 51. can be successively brought into register with the sight opening 49, in order to vary the size of the object I may, if desired, provide a light reducer, such a's'a translucent substance, which is shown at 52, in Fig. 2,

within the tube 49 and serving to modify or reduce the light from the lamp 10. By this means. it will be understood that the point of fixation has a light opening andis further provided with means for varying the'size of said opening, as may be desired.

From the above, it will be understood that I provide the perimeter with a. point of fixation having a light opening, the size of which may be varied, and by means of the source of light 10', rays of light can be caused to emanate fromthe sight opening, in order that the perimeter may be employed in a dark room. I also provide a point of fixation which will reflect light by reason of.

the light reducen52 which is generally of a' white substance, showing through the stated openings when the source of light '10 is inoperative. A test object is provided which is movably supported with respect to said point'offixation and I provide color reflectors thereon, in order that the light 'may be reflected. therefrom and I further provide the test object with a source of light 1'8 and with light filters, which are adapted to be positioned into operative relation with respect to said'source of light, in order that the light in difl'erent colors will be transmitted from the test object, I so that the perimeter is adapted for use in a dark room, as will be evident.

It will be apparent that by rotating the disk 32 the size of the object may be varied, and when the perimeter is used in the light,

the proper color reflector 30 may be brought into operative position with respect to the opening 35, in order that the proper color may be reflected to the eye of the patient undergoing the test. WVhen the perimeter o is used in the dark, the opening 31 in the disk 29 is suitably positioned with respect .to it'he light opening 26, after which the proper light filter carried by the disk 27 is moved to operative position with respect to the light opening 26-and the opening 35, in

xtion.

shown inFig. 13, for this purpose.

While I have, shown but one test object containing both the daylight and electric light tests (reflected and transmitted) it will be understood that I may accomplish the desired results in any suitable manner, whereby either reflected or transmitted light will be obtained.

Having thus described my invention what I claim as new and desire to secure byLetters Patent, is

1. In an optical instrument, a suitable support, a point of fixation carried thereby, a test object carrier movably supported with respect to said point of fixation, and means for interchanging on said carrier means for reflecting or transmitting light therefrom.

2. In a perimeter, a suitable support, a point of fixation carried thereby, atest obje'ct, and means carried by said .test object for either reflecting -or transmitting light therefrom.

3. In a perimeter, a suitable support, a point of fixation carried thereby, a test ob- .ject, a source of light carried by said test object, and means carried by said test object for .either reflecting or transmitting light in different colors.

4. In a perimeter, a suitable support, a point of fixation carried thereby, a test object movably supported with respect to said point of fixation, an electric'lamp carried by said test object, and means carried by said test object for either reflecting or transmit ting light in different colors.

' 5. In a perimeter, a suitable support, a point of fixation carriedthereby, a test object movably supported with respect to said point of fixation, an electric lamp carried by said test object, a disk movably mounted on said ,test object, color transmitting media mounted on said disk and adapted to be moved to operative position, a second disk movablv mounted 'on said test object, and color reflecting media mounted on said disk and adapted tobe moved to operative posi- 6. In a perimeter, a suitable support, a point of fixation carriedthereby, a test object movably mounted with respect to said point of fixation, a source'of light carried by said test object, a light opening, light filters, color reflecting means, and means for supporting said light filters and said color reflecting means whereby the same may be brought to operative. position with respect to said point of -fixation.-

7. In a perimeter, a suitable support, a

oint offlxation carried thereby, a test ob-, e'ct movably mounted with respect to said point of fixation, a souree' of light carried by said test object, a sight opening, a light opening, light filters, color reflecting-media,

9.'In a perimeter, a suitable support, a

point of fixation adapted to reflect or trans .mit light, a test object, movably supported with respect to said point of fixation, having a light opening, a source of light suitably mounted with respect to said light opening, and means for varying the-amount, of light transmitted by said light opening 10. In a perimeter, a suitable support, a p

point of fixation, a source of light suitably carried .by said point of fixation, a test object and a second source of light suitably carried by said test object, means carried by said test objectfor transmitting or for refleeting light in diflerent colors, and means for indicating the relative position of said tion. 1

, 11.:In aperimeter, a suitable support, point of fixation adapted to either reflector transmit light, a test object, means carried by said test object for reflecting light in different colors and' means for indicating the relative position of said test object withrespect to said point of fixation.

12. In a perimeter, a suitable support, a luminous point of fixation. means for governing the diameter of said luminous point of fixation an adjustable test object having means for either transmitting or. reflecting light in diiierent colors, means for alteringv therelative position of said test object and v saidapoint of fixation, and means for determining "the said relative position of saidtest object and said point of fixation.

HENRY L. DE ZENG.

Witnesses:

. R. HoLnRmGn,

F. WM.- FRITZ.

40 test object with respect to said point of fixa- 

